ROUGH IDLE I have an 81 toyota Celica 22R that is running rough. It has shut off a few times when we take our foot off the gas. The problem comes and goes and is not consistant. When it first happened we floored it and it went away... then it happened again so we changed the fuel lines and gas tank which had lot of rust inside. It showed in the fuel filter which was filled with rust particles inside. AFter that the problem went away for a few months. But now it is back. If we floor it sometimes it goes away and runs good for a few days. Then it comes back again. ANyone have any ideas?

You have rust particles in the float bowl. The easiest thing to do is remove the side cover of the carb (the thing that unbolts, with a sight-glass on it) and spray carb cleaner into the float bowl until it is clean.

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Related Questions:

that is misfire.
can be caused by many things.
1 or more cylinders misfiring.
you got tools? meters , and all that to fix a car, or are you asking
for a wild guess/
ill guess, never tuned up at 60k mile service points.

Fuel injected or carburetor? If it has a carb check the idle circuit! Also look down the top of carb with air filter off and make sure fuel is not dripping down the inside venturies. Take some carb cleaner an check for a lean mixture at idle and also use the carb cleaner to check for vacuum leaks around base of carb.

have your idle control switch check, easy and inexpensive to replace. The idle control switch is what keep the engine stay idle. also have your throttle body clean by a professional having that many miles, it will give you better gas mileage.

Try running a Can or two of B12 Chemtool through the Fuel system with a Full tank of gas. 1 can per tank. Usually works for me. This will clean the Injectors, Jets, Valves, and ANY Carbon buildup anywhere in there.

You said you replaced the plugs - did you use the toyota platinum plugs? I found out the hard way that even the platinum plugs from bosch or any other kind of platinum plug just doesn't work right. Yes, they are more expensive from toyota, but they can make a difference in the way the engine runs.